Opal daga Mondulkiri, Cambodia - Sabon Sabunta 2022 - Bidiyo

Sayi opal na halitta a cikin shagon mu na gemstone

Kambodiya opal

Opal wani nau'i ne na siliki mai hydrated amorphous (SiO2 nH2O); Ruwan sa na iya bambanta daga 3 zuwa 21% ta nauyi, amma yawanci 6 zuwa 10%. Saboda yanayin amorphous, an rarraba shi azaman mineraloid, sabanin sifofin crystalline na silica, waɗanda aka rarraba a matsayin ma'adanai.

Ana ajiye shi a ƙananan zafin jiki kuma ana iya samuwa a cikin raƙuman ruwa na kusan kowane nau'i na dutse, mafi yawan faruwa tare da limonite, sandstone, rhyolite, marl, da basalt. Opal shine babban dutsen ƙasa na Ostiraliya.

Tsarin ciki na launi mai wasa na opal yana sa ya haskaka haske. Dangane da yanayin da aka yi shi, yana iya ɗaukar launuka da yawa. Duwatsu suna fitowa daga fili zuwa fari, launin toka, ja, orange, rawaya, kore, shuɗi, shuɗi, ruwan hoda, ruwan hoda, slate, zaitun, ruwan kasa da baki.

Daga cikin wadannan inuwa, duwatsun baƙar fata sune mafi wuya, yayin da fari da kore suka fi yawa. Opals sun bambanta da girman gani daga faɗuwa zuwa mai ɗaukar nauyi.

Wasan opal na launi yana nuna bambancin tsaka-tsaki na launuka na ciki kuma, kodayake mineraloid, yana da tsarin ciki. A kan ma'auni na ƙananan ƙananan, opal mai launi yana kunshe da silica spheres 150 zuwa 300 nm a diamita a cikin grid hexagonal ko cubic mai yawa.

JW Sanders ya nuna a tsakiyar shekarun 1960 cewa waɗannan nau'ikan ma'adini da aka ba da umarni sun samar da launuka na ciki ta hanyar haifar da tsangwama da rarrabuwar hasken da ke wucewa ta hanyar microstructure na opal.

Madaidaicin girman da marufi na waɗannan beads suna ƙayyade ingancin dutse. Lokacin da tazarar da ke tsakanin jirage da aka tattara akai-akai na sasanninta ya kai kusan rabin tsawon tsawon abin da ake iya gani na haske, hasken da ke wannan tsayin tsayin daka zai iya bazuwa ta hanyar grating da jiragen da aka tattara.

Launuka da aka lura ana ƙaddara su ta hanyar nisa tsakanin jiragen sama da kuma daidaitawar jiragen sama game da hasken da ya faru. Ana iya siffanta wannan tsari ta dokar Bragg diffraction.

Opal daga Mondulkiri, Cambodia.

Sayi opal na halitta a cikin shagon mu na gemstone